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nixos/nixos-option: Refactor: Move functions around

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Chuck 2019-12-17 11:08:24 -08:00 • committed by Maximilian Bosch
parent 09ac7cb55f
commit 9dd23e8743
1 changed files with 93 additions and 93 deletions
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186
nixos/modules/installer/tools/nixos-option/nixos-option.cc
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@ -197,6 +197,99 @@ void recurse(const std::function<bool(const std::string & path, std::variant<Val
} }
} }
bool optionTypeIs(Context & ctx, Value & v, const std::string & soughtType)
{
try {
const auto & typeLookup = v.attrs->find(ctx.state.sType);
if (typeLookup == v.attrs->end()) {
return false;
}
Value type = evaluateValue(ctx, *typeLookup->value);
if (type.type != tAttrs) {
return false;
}
const auto & nameLookup = type.attrs->find(ctx.state.sName);
if (nameLookup == type.attrs->end()) {
return false;
}
Value name = evaluateValue(ctx, *nameLookup->value);
if (name.type != tString) {
return false;
}
return name.string.s == soughtType;
} catch (Error &) {
return false;
}
}
bool isAggregateOptionType(Context & ctx, Value & v)
{
return optionTypeIs(ctx, v, "attrsOf") || optionTypeIs(ctx, v, "listOf") || optionTypeIs(ctx, v, "loaOf");
}
MakeError(OptionPathError, EvalError);
Value getSubOptions(Context & ctx, Value & option)
{
Value getSubOptions = evaluateValue(ctx, *findAlongAttrPath(ctx.state, "type.getSubOptions", ctx.autoArgs, option));
if (getSubOptions.type != tLambda) {
throw OptionPathError("Option's type.getSubOptions isn't a function");
}
Value emptyString{};
nix::mkString(emptyString, "");
Value v;
ctx.state.callFunction(getSubOptions, emptyString, v, nix::Pos{});
return v;
}
// Carefully walk an option path, looking for sub-options when a path walks past
// an option value.
struct FindAlongOptionPathRet
{
Value option;
std::string path;
};
FindAlongOptionPathRet findAlongOptionPath(Context & ctx, const std::string & path)
{
Strings tokens = parseAttrPath(path);
Value v = ctx.optionsRoot;
std::string processedPath;
for (auto i = tokens.begin(); i != tokens.end(); i++) {
const auto & attr = *i;
try {
bool lastAttribute = std::next(i) == tokens.end();
v = evaluateValue(ctx, v);
if (attr.empty()) {
throw OptionPathError("empty attribute name");
}
if (isOption(ctx, v) && optionTypeIs(ctx, v, "submodule")) {
v = getSubOptions(ctx, v);
}
if (isOption(ctx, v) && isAggregateOptionType(ctx, v)) {
auto subOptions = getSubOptions(ctx, v);
if (lastAttribute && subOptions.attrs->empty()) {
break;
}
v = subOptions;
// Note that we've consumed attr, but didn't actually use it. This is the path component that's looked
// up in the list or attribute set that doesn't name an option -- the "root" in "users.users.root.name".
} else if (v.type != tAttrs) {
throw OptionPathError("Value is %s while a set was expected", showType(v));
} else {
const auto & next = v.attrs->find(ctx.state.symbols.create(attr));
if (next == v.attrs->end()) {
throw OptionPathError("Attribute not found", attr, path);
}
v = *next->value;
}
processedPath = appendPath(processedPath, attr);
} catch (OptionPathError & e) {
throw OptionPathError("At '%s' in path '%s': %s", attr, path, e.msg());
}
}
return {v, processedPath};
}
// Calls f on all the option names // Calls f on all the option names
void mapOptions(const std::function<void(const std::string & path)> & f, Context & ctx, Value root) void mapOptions(const std::function<void(const std::string & path)> & f, Context & ctx, Value root)
{ {
@ -452,99 +545,6 @@ void printListing(Out & out, Value & v)
} }
} }
bool optionTypeIs(Context & ctx, Value & v, const std::string & soughtType)
{
try {
const auto & typeLookup = v.attrs->find(ctx.state.sType);
if (typeLookup == v.attrs->end()) {
return false;
}
Value type = evaluateValue(ctx, *typeLookup->value);
if (type.type != tAttrs) {
return false;
}
const auto & nameLookup = type.attrs->find(ctx.state.sName);
if (nameLookup == type.attrs->end()) {
return false;
}
Value name = evaluateValue(ctx, *nameLookup->value);
if (name.type != tString) {
return false;
}
return name.string.s == soughtType;
} catch (Error &) {
return false;
}
}
bool isAggregateOptionType(Context & ctx, Value & v)
{
return optionTypeIs(ctx, v, "attrsOf") || optionTypeIs(ctx, v, "listOf") || optionTypeIs(ctx, v, "loaOf");
}
MakeError(OptionPathError, EvalError);
Value getSubOptions(Context & ctx, Value & option)
{
Value getSubOptions = evaluateValue(ctx, *findAlongAttrPath(ctx.state, "type.getSubOptions", ctx.autoArgs, option));
if (getSubOptions.type != tLambda) {
throw OptionPathError("Option's type.getSubOptions isn't a function");
}
Value emptyString{};
nix::mkString(emptyString, "");
Value v;
ctx.state.callFunction(getSubOptions, emptyString, v, nix::Pos{});
return v;
}
// Carefully walk an option path, looking for sub-options when a path walks past
// an option value.
struct FindAlongOptionPathRet
{
Value option;
std::string path;
};
FindAlongOptionPathRet findAlongOptionPath(Context & ctx, const std::string & path)
{
Strings tokens = parseAttrPath(path);
Value v = ctx.optionsRoot;
std::string processedPath;
for (auto i = tokens.begin(); i != tokens.end(); i++) {
const auto & attr = *i;
try {
bool lastAttribute = std::next(i) == tokens.end();
v = evaluateValue(ctx, v);
if (attr.empty()) {
throw OptionPathError("empty attribute name");
}
if (isOption(ctx, v) && optionTypeIs(ctx, v, "submodule")) {
v = getSubOptions(ctx, v);
}
if (isOption(ctx, v) && isAggregateOptionType(ctx, v)) {
auto subOptions = getSubOptions(ctx, v);
if (lastAttribute && subOptions.attrs->empty()) {
break;
}
v = subOptions;
// Note that we've consumed attr, but didn't actually use it. This is the path component that's looked
// up in the list or attribute set that doesn't name an option -- the "root" in "users.users.root.name".
} else if (v.type != tAttrs) {
throw OptionPathError("Value is %s while a set was expected", showType(v));
} else {
const auto & next = v.attrs->find(ctx.state.symbols.create(attr));
if (next == v.attrs->end()) {
throw OptionPathError("Attribute not found", attr, path);
}
v = *next->value;
}
processedPath = appendPath(processedPath, attr);
} catch (OptionPathError & e) {
throw OptionPathError("At '%s' in path '%s': %s", attr, path, e.msg());
}
}
return {v, processedPath};
}
void printOne(Context & ctx, Out & out, const std::string & path) void printOne(Context & ctx, Out & out, const std::string & path)
{ {
try { try {